Home / 1,312.68-1,968.66-387.96

Finding the Fourth Proportional to 1,312.68, 1,968.66 and 387.96

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Solution

The fourth proportional to 1,312.68, 1,968.66 and 387.96 is: 581.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.68 : 1,968.66 = 387.96 : x
  2. Step 2: Convert to fraction form
    1,312.68/1,968.66 = 387.96/x
  3. Step 3: Cross multiply
    1,312.68x = 1,968.66 × 387.96
  4. Step 4: Simplify right side
    1,312.68x = 763,761.33
  5. Step 5: Solve for x
    x = 763,761.33/1,312.68
  6. Step 6: Final answer
    x = 581.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.